Everytown for Gun Safety, an anti-gun organization founded by former New York Mayor Michael Bloomberg, is spending $100,000 in advertising around Indianapolis to attack the NRA during the gun rights group’s annual convention, which started Thursday.

The campaign reportedly includes messaging on digital billboards along a major highway near the Indiana Convention Center. In addition, a mobile truck billboard will circle the convention center, the IndyStar will be running full-page ads in its print edition each day of the convention, and digital ads will appear on Facebook, according to the group’s statement.

Group - Report - NRA - Crisis - Claims

The group also released a report, “NRA in Crisis,” that claims to have uncovered shady financial dealings by NRA management and...